The file name changes below allow you to play beta 1.8 and other versions that may not be compatible with 1.4.7 due to texture changes in bewteen those versions.

Terrain
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Rename "terrain_b1.8.png" to "terrain.png" if you are playing b1.8 - 1.2.5


Mobs
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Take the mobs from the b1.8 folder (located in mobs folder) and put them in in the mobs folder if you are playing b1.8 - b1.9


GUI
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Rename "allitems_b1.8.png" to "allitems.png" (located in the gui folder) if you are playing b1.8 - 1.3

Rename "items_b1.8.png" to "items.png" (located in the gui folder) if you are playing b1.8 - 1.3.2


Armor
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Rename "cloth_1_b1.8.png" and "cloth_2_b1.8.png" to "cloth_1.png" and "cloth_2.png" (located in the armor folder) if you are playing b1.8 - 1.3.2